Metal-founding.



G. B. CARTER.

METAL POUNDING.

I APPLICATION FILED JURY-G, 1911.

1,1 SQQQSO Patented Mar.2,1915.

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C. B. CARTER.

METAL FOUNDING.

APPLICATION FILED JUNE 6, 1911.

Patented Mar. 2,-1915.

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C. B. CARTER.

METAL 'FOUNDING.

APPLICATION FILED 111111: e, 1911.

Patented M21122, 1915.

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G. B. CARTER. METAL POU NDING.

APPLICATION FILED JUNE 6, 1911.

1,1 3Q U66, Patented Mar.2, 1915.

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METAL-FOUNDING.

Application filed June 6, 1911.

To all whom it may concern .Be it known that I, CHARLES B. CARTER, a citizen of the UnitedStates, and a resident ofChicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements in. the Art of Metal-Founding, of which: the following is a specification.

This invention relates to improvements in molding machines, and is a further development of the matter set forth in my Patent No. 974,024, of October 25, 1910, for improvements in metal founding, and in my pending application filed October 19, 1910, Serial .No. 587,886, for improvements in metal founding.

My present improvement relates to the makin of sand molds with magnets embedde in the sand of the mold, for the purpose of holding in proper position within the cavity of the mold any metallic inserts, cores, orthe like, whichv are designed tobe permanently or temporarily incorporated in the casting made in the mold.

In the practical employment of magnets in sand molds, it. has been found difficult to secure the accurate placing of the magnets in the sand, both because of the lack of sufficient care on the part of the molder in initially placing the magnets, and because of the tendency to displace'the magnets in ramming up the sand about them. There is also a tendencyfor magnets to lose power when employed over and over again, as contemplated, because of the extentto which they are heated by the molten metal whenit is poured into the mold. It is of course expected that the magnets will be withdrawn from the sand as soon as possible after the pouring has-taken place, but more or less delays are apt to occur, and in some cases the magnets become heated to such an extent as to have their magnetic power impaired.

With these facts in view, my present improvement contemplates the provision in a molding machine of electromagnets the poles of which project through the mold forming surface of the machine so that the magnets which are to be embedded within the sand of, the mold will beheld in place for the purpose of having their poles placed in contact with the poles of the .electromag nets. "Bypassing current through'the coils of the electromagnets when the mold magnets have been thus positioned. they can be Specification of Letters Patent.

Patented Mar. 2, 1915.

Serial No. 631,524.

clamped so securely in place as to properly and permanently position them during the moldforming operation. At the same time the magnetic flux to which the mold magnet is subjected by its contact with the electromagnet during the mold forming operat1on, will serve to recharge the mold magnets and restore its magnetic powers, in case these have previously become deteriorated by overheating or otherwise.

To these ends, my invention consists in the method, apparatus and structural peculiarities herein set forth and particularly polnted out in the appended claims.

In the accompanying drawings,Figure 1 1s a side elevation of a molding machine provided with my improvements in one form. Fig. 2 is a top plan view thereof. Fig. 3 is a top plan view of the machine with its top plate removed, as indicated on line 3-3 of Fig. 1, the operating handle and connections being also omitted from this view. Fig. 4 is a sectional elevation taken on the line 44 of Fig. 2. Fig. 5 is an enlarged transverse section taken on the line 5-5 of Fig. 4. Fig. 6 is a perspective detail of one of the magnets designed to be used with this machine. Figs. 7 and 8 are sectional views of a slightly modified construction showing two positions of the parts. Fig. 9 a vertical cross-sectional view of the completed mold.

The machine more particularly here illustrated is designed for making the cope of sand molds for brake shoes, and like most such machines, is made double to permit of the casting of two shoes at a time. There is nothing new in its general construction or mode of operation, and any one of numerous commercial machines now on the market might be employed for the purpose and have my improvements applied to it.

Briefly, the molding machine illustrated embodies a top frame plate 1 which is provided on its upper surface with a convex mold or stripping plate 2 the curvature of which corresponds to that of the back of the brake shoe for the making of molds for which the machine is designed. The end lugs 3 and a center lug 4 of the mold plate are fitted through openings in the mold plate 1 and are dropped down out of the sand as soon as the latter has been rammed and before the flask 5 has been lifted'ofi' the machine. To this end these lugs are secured to a drop plate 6 which is carried by l links 7 secured to rock arms 8. These latter are secured to shafts 9 which carry intermeshing segments 10. One of these shafts is provided with a crank handle 11 and by swinging this crank through an arc of movement the rockarms 8 ma be oscilthe crank handle is swung down. In'the drawings, Figs. 1 and Q assume the drop piate and lugs to have been lowered, while Figs. 4 and5 assume them to have been raised. The application ofmy improvements to this molding machine primarily involves simply the mountin of an electromagnet on the mold plate with its poles 13 projecting up through the latter so as to stand approximately flush with the convex.

mold forming surface of said plate,'and so as to engage the pole pieces of the horse shoe magnets M which are to be embedded in the mold. Desirably a bushing of nonmagnetic material, such as brass, w1ll be provided in the mold plate or .strlpp ng plate around the opening through-. 'wh1 ch the poles 13 project, as shown at'26 n Fig. '5, and the lug 4 of the drop plate Wlll also be made of non-magneticmetal where 1t comes in contact with these poles.

As herein shown, the electromagnet equipment consists of a U-shaped frame 14 of soft steel and two coils 15 wound upon the legs of this frame piece. Owing to the duplex nature of the molding machine and for the purpose of enabling a single electromagnet to suflice for both sides of the machine, the pole pieces 16are made double, as

better shown in Fig. 5, so that the complete electromagnet'has four poles, two of which are positive and two negative. The horse shoe magnets M are of course placed upon these electromagnetic poles with their poles in reversed relations, minus to plus and plus to minus, and to aidthe molder in quickly positioning his horse shoe magnets so as to bring their poles in this relation tothe electromagnetic poles of the machine, a notch N is conveniently located-in one edge of the magnet, preferably in a position Where it would naturally be felt at once with the thumb if the magnet were picked 7 up properly, or missed from beneath the thumb,uif the magnet happened to be reversed. The electric circuit through the magnet from any suitable source of current is completed by conductors 17 and 18 and switch brushes 19 and 20, one of which,,is

secured to an insulated block 21 on the under side of the top frame plate 1 while the other is secured to an insulated block 22 on the upper side of the drop plate 6. iBy-this arrangement the circuit is automatically completed when the crank handle is pushed down to raise the drop plate and lugs into operative position, and is autothe horse shoe magnet will hold the latter securely clamped in position during the operation of filling the mold with sand and ramming it about the magnets, while the passing of the magnet flux through the magnet during the operation will tend to restore its magnetic strength if previously deteriorated, so that when the mold is removed from the machine, the magnet will exercise its full strength in holding up the back or other metallic insert or the like,v

which the magnet is designed to position in the mold. The lowering of the drop plate and lugs preliminary to removing the. flask from the machine after the making of the cope has been completed, will open the circuit and relieve the magnetic stress, thus permitting the horse shoe ma nets to be lifted with the cope. Ordinarily the supporting power of the sand will be sufiicient to lift the poles of the magnets M from the electromagnetic poles without difliculty when the flask is lifted. In case, however, there should be any tendency for the horse shoe magnets to 1 stick to the electromagnetic poles to such an extent as to break down the sand or loosen the magnets in the sand, the electromagnetic equipment may be arranged to drop down with the drop plate and lugs when the crank handle is thrown: back into the position shown in Fig. 1. By

this constructionand by making the poles of the magnets M slightly wider than the poles of the magnets 13, as shown in Fig. 5, the engagement of the overlapping corners of the magnets M with the top of the mold plate when the poles 13 are dropped, will serve to positively separate the parts without disturbing the sand. Figs. 7 and 8 illustrate a construction modified to this end, and havin its magnet yoke 14 suspended from the that the magnet and its poles 13 rise and fall with the dro plate and lugs. When the plate is raise the magnet poles 13 lie substantially flush with the surface of the mold plate, as already described and as illus' The magnets M being wider than the openrop plate 6. by a hanger 23, .so

ings in the mold plate through which the magnet poles 13 descend (see Fig. 5), are

left in normal position with their corners resting upon the surface of the mold plate, while the electromagnetic poles 13 drop from beneath them. Screws 24 are in this construction shown as passed through the poles 13 into the lug 4 to secure these parts firmly together. To aid the molder in rapidly and accurately placing the magnets M in contact with the poles 13, the latter are shown as made slightly concave, while the ends of the magnets M are made convex to fit them. One end of each magnet M is also shown as provided with a notch adapted to fit over a corresponding lug 27 on the opposed pole piece 13, so that the magnets M' must be properly positioned on the poles 13 before they will rest there with any degree of stability. Any other suitable interfitting construction of. the two sets of poles will of course secure similar results.

I claim 1. The method of simultaneously holding and recharging magnets to be embedded in sand molds, which consists in bringing the poles of the magnets into reverse contact with the poles of an electromagnet and passing a current through the coils of said electromagnet during the pperationof forming the sand mold about the magnets, substantially as and for the purpose described.

2. A molding machine provided with an electric magnet the positive and negative poles of'whichjproject through the mold plate into the sand cavity of the flask to magnetically secure in place in reverse con tact the poles of the magnet to be rammed into the sand, substantially as and for the purpose described.

3. The combination with a molding machine, of an electromagnet having exposed positive and negative poles, of permanent magnets placed with its poles in reverse contact with the 'poles of the electromagnet, and magnetically held there during the mold forming operation, substantially as and for the purpose described.

4. A molding machine provided, with a stripping plate, a drop plate having projections extending through openings in the stripping plate, means for raising and lowering the drop plate and projections, and an electromagnet secured to the drop plate with its poles projecting through the stripping plate to secure permanent magnets in place within the flask during the mold forming operation, substantially as and for the purpose specified.

5. A molding machine provided with a stripping plate, a drop plate having projections extending through openings in the stripping plate, means for raising and loweringthe drop plate and projections, and an electromagnet secured to the drop plate with its poles projecting through the stripping plate, in combination with permanent magnets placed in contact with the poles of the electromagnet and held thereby during the mold forming operation, said permanent magnets being wider than the pole openings in the stripping plate, substantially as and for the purpose described.

6. A molding machine provided with electromagnets the poles of which are exposed through the mold plate, in combination with permanent magnets having their poles reversely engaging the electromagnetic poles, substantially as and for the purpose described.

7. A molding machine provided with elec tromagnets the poles of which are exposed through the mold plate, in combination with permanent magnets having their poles reversely engaging the electromagnetic poles, the meeting ends of the two sets of magnets being interfitted, substantially as and for the purpose described.

In testimony, that I claim the foregoing as my invention, I affix my signature in presence of two subscribing witnesses, this 5th day of June, A. D. 1911.

CHARLES B. CARTER.

Witnesses:

K. A. CosrELLo, Geo. E. WALDO. 

